US6108994A - Ceiling panel - Google Patents

Ceiling panel Download PDF

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Publication number
US6108994A
US6108994A US09/141,407 US14140798A US6108994A US 6108994 A US6108994 A US 6108994A US 14140798 A US14140798 A US 14140798A US 6108994 A US6108994 A US 6108994A
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US
United States
Prior art keywords
edge
panel
kerf
grid
registration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
US09/141,407
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English (en)
Inventor
Darryl C. Bodine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AWI Licensing LLC
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Armstrong World Industries Inc
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=22495563&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US6108994(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Assigned to ARMSTRONG WORLD INDUSTRIES, INC. reassignment ARMSTRONG WORLD INDUSTRIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BODINE, DARRYL C.
Priority to US09/141,407 priority Critical patent/US6108994A/en
Application filed by Armstrong World Industries Inc filed Critical Armstrong World Industries Inc
Priority to CA002279150A priority patent/CA2279150C/en
Priority to ES99115715T priority patent/ES2229600T3/es
Priority to GB9918776A priority patent/GB2340517B/en
Priority to DE69921247T priority patent/DE69921247T2/de
Priority to EP99115715A priority patent/EP0979908B1/de
Priority to US09/571,785 priority patent/US6230463B1/en
Publication of US6108994A publication Critical patent/US6108994A/en
Application granted granted Critical
Assigned to AWI LICENSING COMPANY, INC. reassignment AWI LICENSING COMPANY, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARMSTRONG WORLD INDUSTRIES, INC.
Assigned to AWI LICENSING COMPANY reassignment AWI LICENSING COMPANY CONFIRMATORY ASSIGNMENT OF PATENTS Assignors: ARMSTRONG WORLD INDUSTRIES, INC.
Priority to US14/154,169 priority patent/USRE45851E1/en
Assigned to BANK OF AMERICA, N.A., AS COLLATERAL AGENT reassignment BANK OF AMERICA, N.A., AS COLLATERAL AGENT NOTICE OF GRANT OF SECURITY INTEREST IN PATENTS Assignors: AWI LICENSING LLC
Assigned to AWI LICENSING LLC reassignment AWI LICENSING LLC CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: AWI LICENSING COMPANY
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/06—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members
    • E04B9/065—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members comprising supporting beams having a folded cross-section
    • E04B9/067—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members comprising supporting beams having a folded cross-section with inverted T-shaped cross-section
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/22—Connection of slabs, panels, sheets or the like to the supporting construction
    • E04B9/28—Connection of slabs, panels, sheets or the like to the supporting construction with the slabs, panels, sheets or the like having grooves engaging with horizontal flanges of the supporting construction or accessory means connected thereto
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/04—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like
    • E04B9/0435—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like having connection means at the edges
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/06—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members

Definitions

  • This invention relates to a panel for use with a supporting grid in a suspended ceiling.
  • the panel is of the type that conceals part or all of the grid, when viewed from below.
  • Suspended ceilings are common. They use a grid of metal beams in the form of an inverted T-section, commonly of a 15/16" flange width dimension, to support the panels.
  • the rectangular openings formed by the grid are generally either 24" ⁇ 24" or 24" ⁇ 48" with correspondingly sized panels. However, irregularly shaped and sized openings and panels are used. Dimensions may be in metric units.
  • the present invention applies to such suspended ceilings and panels.
  • the panels are of various ceiling substrates, such as mineral fiber, fiberglass, wood, metal, plastic, or other composition. They are positioned within the grid opening, and are supported by the grid.
  • the panels are either of the type that expose the grid when the ceilings are viewed from below, or conceal the grid either fully or partially, when viewed from below. This invention involves those panels that conceal the grid when viewed from below.
  • Panels for a ceiling with exposed grids have a form of upper lip extending over the top of the grid with no lip on the panel below the grid. The panel hangs from the grid, by means of this upper lip. Such panel is relatively simple to install, position and remove. These panels are not intended to be locked by themselves to the grid.
  • Panels that conceal the grid from below pose special problems, since the portion of the edge underlying the grid interferes with any simple installation, positioning, and removal. Panels that conceal the grid, however, are desirable for among other benefits, their appearance, as well as their ability to lock to the grid.
  • the grid can be partially or totally hidden. Additionally, since the panels of this type cover the metal grid, they can have a beneficial effect during a fire, since they serve to insulate the metal from the effects of the heat, particularly, where panels are of a fire retardant material, as is generally the case.
  • Panels locked to the grid which give no visual clue to their removal procedure also provide a degree of security against unauthorized access to the space above the ceiling.
  • the installer must position each panel visually from below, with a resulting slowdown in installation. Even without the necessity of visual positioning during installations, in prior art panels that conceal, the installation is a relatively slow procedure.
  • Prior art patents relating to panels in suspended ceilings that conceal the grid, and in some instances lock include U.S. Pat. Nos. 2,218,092, 3,640,012, 3,714,752, 3,900,997, 4,189,895, 4,696,141, 4,760,677, 4,862,663, and U.K. Patent 2,200,151B, and French patents 1,313,963, and 1,227,191. These panels show various edge designs that engage the grid.
  • the panel of the present invention is easy to install in a ceiling.
  • Two opposed active, parallel edges, designated first and second edges A and B, different from one another in profile, without interference from at least two opposed passive third and fourth edges C and D that can be the same as one another, enable the panel to be pivoted about designated active first edge A in engagement with a flange, into a generally horizontal position.
  • the panel is then shifted to engage the opposing active edge, designated second edge B, with its adjacent grid flange.
  • the panel slightly rotates, seats, and locks into position.
  • the opposed active first and second edges A and B each with its distinctive profile different from the other, serve successively as hinges, with the adjacent grid flange, to install the panel.
  • the panel is also easy to remove from the ceiling, providing the removal procedure is known. Once it is known how to locate a specific edge, the installation steps are simply reversed, to remove the panel.
  • the present invention can be used not only with rectangular panels, but also with hexagonal, octagonal, and other regular and irregular shapes. It is only necessary that the panel have two active, opposing, parallel first and second edges A and B having distinctive profiles, different from one another, each with the profile disclosed herein. The remaining edges of the panel are passive.
  • FIG. 1 is a perspective view, from below, of a ceiling that uses the panel of the invention, one of which is shown in position as it is being installed.
  • FIG. 2 is a perspective view of the panel of the invention showing first and third edges A and C.
  • FIG. 3 is a perspective view of the panel showing second and fourth edges B and D.
  • FIG. 4 is a horizontal sectional view of the ceiling taken on the line 4--4 in FIG. 1, showing first and second edges A and B of the panel in profile.
  • FIG. 5 is a horizontal sectional view similar to FIG. 4 taken on the line 5--5 in FIG. 1, showing third and fourth edges C and D in profile.
  • FIGS. 6A through 6D are schematic horizontal sectional views, with the panel first and second edges A and B in profile, showing the progressive steps in installing a panel in the ceiling.
  • FIGS. 7A through 7D are schematic horizontal sectional views with the panel first and second edges A and B in profile, showing the progressive steps in removing a panel from the ceiling.
  • FIG. 8 is a partial sectional view of panels that conceal the grid to a greater degree than the panels shown in FIGS. 6A through 6D.
  • FIG. 9 is a partial sectional view of an embodiment of the invention where first and second edges A and B of the panels totally conceal the grid.
  • FIG. 9A is a view similar to FIG. 9 showing an alternative embodiment of edge B, where first and second edges A and B conceal the grid.
  • FIGS. 10 and 11 show a panel in partial sectional view having a locking spring.
  • the panel 20 of the invention is of the type, which is installed in a grid ceiling 21, supported by metal grids 22 having inverted T cross-sections.
  • Such grids 22 are generally used to form a square opening 23, of a 24" ⁇ 24" dimension as shown in FIG. 1, or a rectangular opening, 24" ⁇ 48".
  • the present invention is applicable to either such size opening, or any other size rectangular opening, as well as hexagonal, octagonal, or other regular or irregular shapes, as will later be explained.
  • a panel may carry a decor or fanciful design on its lower face, or a sculptured surface that provides a three dimensional effect to the ceiling.
  • the invention is shown on a square panel, of for instance, a 24" ⁇ 24" dimension.
  • the panel 20 can be of any various substrates, such as mineral fiber, fiberglass, wood, metal, plastic, or other composition.
  • the substrate however, must be capable of having formed on a panel the edge profiles disclosed herein.
  • the thickness of the panel can be determined by forming the edges and then inserting and removing the panel to determine whether the edges resist damage, and are capable of supporting the panel in the ceiling, without being damaged. A thicker panel, however, results in the use of more material, so that an economic judgment must be exerted with respect to suitability of material used in this invention.
  • Grid 22 as seen in cross-section in the figures has, in the well-known fashion, a bulb 25, a web 26, and a flange having sides 28 and 29.
  • the total flange width is generally 15/16".
  • the invention works with all size flanges. As can be seen from the detailed disclosure that follows, the profile must be correspondingly sized to accommodate the different sized flanges.
  • the panel 20, in position in ceiling 21, has a flat top plane 31, and a flat bottom plane 32.
  • the description of the panel in the following disclosure refers to the panel elements when the panel extend in a horizontal plane, as in a ceiling.
  • the invention involves opposed active first and second edges A and B, and opposed passive third and fourth edges C and D, on panel 20.
  • a and B active edges, are different from one another in profile. The edges are active in installing and removing a panel into and from the grid as later described in the text and drawings.
  • Third and fourth edges C and D passive edges, are alike. These edges are passive in installing and removing the panel from the grid as later shown and described in the drawings and text.
  • Both first and second edges A and B have a horizontally extending kerf, designated access kerf 33 on edge A and registration kerf 35 on edge B, intended to receive a supporting grid flange side 28 or 29. Registration kerf 35 on edge B has an upperside or tread 30 that extends in a horizontal plane.
  • the access kerf 33 in first edge A is thick and deep enough to slidably receive flange side 28 or 29 of the grid flange, and deep enough to permit opposite second edge B to be rotated up into a position when registration kerf 35 in edge B aligns with its corresponding grid flange, as seen in FIG. 6B.
  • edge A has a registration step 36 having a vertical riser 34 and a horizontal tread 39.
  • Tread 39 forms the lower horizontal surface of upper lip 42 on edge A.
  • Tread 39 is at the same level as upper side or tread 30 of registration kerf 35 in edge B, which forms the lower surface of upper lip 43 on edge B.
  • Tread 39 in first edge A and upper side or tread 30 of registration kerf 35 on second edge B form the supporting surfaces for panel 20 when the panel is in seated position on flange sides 28 and 29, as seen in FIG. 6D.
  • Riser 34 in registration step 36 in edge A, and the inwardmost depth of registration kerf 35 at 53 in edge B position the panel 20 between flanges 28 and 29 as seen in FIGS. 4 and 6B.
  • Wall 37 on edge C and wall 38 on edge D likewise position panel 20 between flange sides 28 and 29 in a direction between those edges.
  • Upper lip 42 on edge A is cut back at 55, and upper lip 43 is cut back at 56 to avoid interference with the installation and removal of panel 20 into ceiling 21. Such installation and removal will be explained.
  • Lower lip 41 on edge B is thicker than lower lip 40 on edge A.
  • Lower lip 45 on edge C and lower lip 46 on fourth edge D also contribute to locking the installed panel 20 to the grid 22, as well as concealing the grid.
  • the panel 20 is positioned horizontally within ceiling opening 23 by registration kerf 35, riser 34 of registration step 36, and wall 37 on third edge C and wall 38 on fourth edge D.
  • Third and fourth edges C and D also have cutouts 50 on third edge C and 51 on fourth edge D, which permit installation and removal of the panel 20 without interference from these edges.
  • Access kerf 33 and registration kerf 35 are at different levels in the thickness of the panel 20. As viewed in profile, registration kerf 35 is at a higher level in the panel than access kerf 33. This permits a hinge action in the installation and removal of the panel as will be evident from the later explanation.
  • edges A, B, C, and D on the rectangular panel 20 of the invention provide means for installing, positioning, locking, unlocking, and removing the panel in and from a suspended ceiling supported by a grid. The same means used for installing and locking are used to unlock and remove the panel from the ceiling.
  • the panel edges A, B, C, and D also have means to conceal the flanges of the supporting grid when the panel is in place in the ceiling.
  • the means for installing include the kerfs 33 in first edge A and 35 in second edge B of the panel.
  • the registration kerf 35 in edge B is at a higher level in the panel than access kerf 33 in first edge A. Both kerfs extend in horizontal planes.
  • the panel 20 is first brought into position toward the ceiling in an inclined position, as shown in FIGS. 1 and 6A, with first edge A uppermost.
  • the panel 20 is installed by first engaging the access kerf 33 in first edge A to form with the grid flange side 28, a hinge to pivot the panel 20 to a generally horizontal position in the ceiling 21, against the grid 22, wherein lower lip 41 on second edge B abuts flange side 29.
  • the registration kerf 35 in second edge B will align with the adjacent flange side 29.
  • the entire panel is then shifted, or translated, toward the right as seen in FIG. 6C toward second edge B to seat the registration kerf 35 in second edge B on its adjacent flange side 29 on the grid 22.
  • the access kerf 33 in first edge A slides away from and out of its adjacent flange, permitting first edge A to drop until it reaches the tread 39 of registration step 36, as seen in FIG. 6D.
  • the panel 20 now lies in the horizontal plane of the ceiling, since the level of the tread 39 of the registration step 36 in first edge A is the same as that of the upper side or tread 30 of registration kerf 35 in second edge B, as seen in FIG. 6D.
  • the panel 20 can be slightly shifted back to the left against the vertical riser 34 of registration step 36, in what in effect is a feedback effect. This enables the installer to readily and virtually automatically minutely position the panel horizontally with a minimum of visual judgment, using simply a technique of feel.
  • the grid 22 When viewed from below, the grid 22 partially concealed in the embodiment described or totally concealed in an embodiment described later.
  • the panels 20 give no clue as to how they are installed, or how they can be removed.
  • the panels 20 are removed in steps opposite to that in installation. To know where to begin, however, one must know which is first edge A. Random exploration without knowing what one is looking for does not cause the panels to unlock.
  • first edge A When a slight upward force is exerted on the center of the panel, first edge A will move slightly upward about the registration kerf 35 in second edge B as a hinge as seen in FIG. 7A. There is no interference from third and fourth edges C and D to this movement. One can then proceed with removal, based on the reversal of the installation steps.
  • the panel 20 is shifted to the left, as seen in FIG. 7B. This permits second edge B to drop out of the grid as seen in FIG. 7C. Panel 20 can then fall free, as seen in FIG. 7D.
  • FIG. 8 there is shown an alternative embodiment that conceals more of the grid than that of the embodiment described earlier.
  • Lower lip 40' on first edge A has a cutout 47'
  • lower lip 41' on second edge B has a cut-out 48', which permit the insertion and removal procedure described above to take place without interference.
  • cutouts 47" and 48" in lower lips 40" and 41" again permit installation and removal of the panel, where the panels totally conceal the grid.
  • cutout 48" is beveled at 59 to yield more space than the square cutout of FIG. 9.
  • cutouts 47" and 48" extended surfaces 65' and 65 serve to guide access kerf 33 and registration kerf 35 into alignment with the adjacent grid flange and contribute to the feedback positioning aspect of the invention.
  • Lower lips 40' and 41' in the embodiment of FIG. 8, and lips 40" and 41" in the embodiment of FIG. 9 are suitably extended to provide the degree of grid concealment desired.
  • Lower lips 45 and 46 on passive third and fourth edges C and D are also modified to provide the degree of grid concealment desired.
  • any or all of the lower lips in any of the embodiments of the invention may be of irregular shape, such as scalloped, when viewed from below, to provide a further decorative effect to the ceiling.
  • FIG. 10 and 11 show an embodiment that uses a security spring 52 to increase the upward pressure necessary to lift first edge A during the removal procedure.
  • the convex compression spring 52 of inverted U shape extends lengthwise in the first edge A.
  • FIG. 10 shows the spring 52 in relaxes form with the panel installed in the ceiling.
  • FIG. 11 shows the spring 52 in compressed form in the position shown corresponding to FIG. 7A of the removal procedure.
  • the invention can be used on panels with shapes other than rectangular. Such shapes must have opposed active first and second edges A and B with the profiles disclosed above. The remaining edges must all be passive, with no upper lips. Such shapes will have at least two opposed passive third and fourth edges C and D, each of which is positioned between the active first and second edges A and B.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Finishing Walls (AREA)
  • Mirrors, Picture Frames, Photograph Stands, And Related Fastening Devices (AREA)
  • Residential Or Office Buildings (AREA)
US09/141,407 1998-08-12 1998-08-12 Ceiling panel Ceased US6108994A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US09/141,407 US6108994A (en) 1998-08-12 1998-08-12 Ceiling panel
CA002279150A CA2279150C (en) 1998-08-12 1999-07-30 Ceiling panel
ES99115715T ES2229600T3 (es) 1998-08-12 1999-08-09 Panel de techo.
GB9918776A GB2340517B (en) 1998-08-12 1999-08-09 Ceiling panel
DE69921247T DE69921247T2 (de) 1998-08-12 1999-08-09 Deckenplatte
EP99115715A EP0979908B1 (de) 1998-08-12 1999-08-09 Deckenplatte
US09/571,785 US6230463B1 (en) 1998-08-12 2000-05-16 Ceiling panel
US14/154,169 USRE45851E1 (en) 1998-08-12 2014-01-13 Ceiling panel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US09/141,407 US6108994A (en) 1998-08-12 1998-08-12 Ceiling panel

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US09/571,785 Continuation US6230463B1 (en) 1998-08-12 2000-05-16 Ceiling panel
US14/154,169 Reissue USRE45851E1 (en) 1998-08-12 2014-01-13 Ceiling panel

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Publication Number Publication Date
US6108994A true US6108994A (en) 2000-08-29

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Family Applications (3)

Application Number Title Priority Date Filing Date
US09/141,407 Ceased US6108994A (en) 1998-08-12 1998-08-12 Ceiling panel
US09/571,785 Expired - Lifetime US6230463B1 (en) 1998-08-12 2000-05-16 Ceiling panel
US14/154,169 Expired - Lifetime USRE45851E1 (en) 1998-08-12 2014-01-13 Ceiling panel

Family Applications After (2)

Application Number Title Priority Date Filing Date
US09/571,785 Expired - Lifetime US6230463B1 (en) 1998-08-12 2000-05-16 Ceiling panel
US14/154,169 Expired - Lifetime USRE45851E1 (en) 1998-08-12 2014-01-13 Ceiling panel

Country Status (6)

Country Link
US (3) US6108994A (de)
EP (1) EP0979908B1 (de)
CA (1) CA2279150C (de)
DE (1) DE69921247T2 (de)
ES (1) ES2229600T3 (de)
GB (1) GB2340517B (de)

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US20030182894A1 (en) * 2000-03-10 2003-10-02 Niels Galsgaard Method of installing a set of ceiling panels
US20030226322A1 (en) * 2002-06-10 2003-12-11 Worthington Armstrong Venture Grid for a suspended ceiling
US20050050822A1 (en) * 2003-09-10 2005-03-10 Gary Shapiro Ceiling panel
US20060162283A1 (en) * 2005-01-13 2006-07-27 Moser Rossel Roberto F Removable ceiling panel
US7152383B1 (en) * 2003-04-10 2006-12-26 Eps Specialties Ltd., Inc. Joining of foam core panels
US20070011975A1 (en) * 2005-06-24 2007-01-18 American Metal Ceiling Panel Manufacturer Decorative ceiling panel
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US20110078970A1 (en) * 2009-10-01 2011-04-07 Certainteed Corporation Ceiling tile and edge suspension system
US20110123037A1 (en) * 2008-06-27 2011-05-26 Soft Db Inc. Sound masking system and method using vibration exciter
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US8291667B2 (en) 2010-06-24 2012-10-23 Chicago Metallic Corporation Accessible concealed suspended ceiling system
US8327591B2 (en) 2010-03-24 2012-12-11 Wilkinson Jr Edgar L Overhead panel and installation system
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US20150027075A1 (en) * 2012-02-23 2015-01-29 Saint-Gobain Ecophon Ab Suspended ceiling, a ceiling tile and an associated installation method
US9273465B1 (en) * 2014-09-29 2016-03-01 Awi Licensing Company Ceiling system
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WO2016100655A2 (en) 2014-12-18 2016-06-23 Armstrong World Industries, Inc. Integrated ceiling and light system
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US10612236B1 (en) * 2018-11-29 2020-04-07 AES Clean Technology, Inc. Non-walkable clean room ceiling, mounting system, and method
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USD1019989S1 (en) * 2016-11-14 2024-03-26 Certainteed Ceilings Corporation Support member for ceiling system

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US8316607B2 (en) * 2010-04-16 2012-11-27 Ceilings Plus Metal ceiling system having locking panels without visible access holes
US10267039B2 (en) 2012-09-04 2019-04-23 Awi Licensing Llc Ceiling systems
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EP0979908A3 (de) 2001-05-23
ES2229600T3 (es) 2005-04-16
EP0979908A2 (de) 2000-02-16
DE69921247T2 (de) 2005-11-03
CA2279150C (en) 2003-12-02
GB2340517B (en) 2002-11-13
GB2340517A (en) 2000-02-23
CA2279150A1 (en) 2000-02-12
DE69921247D1 (de) 2004-11-25
EP0979908B1 (de) 2004-10-20
US6230463B1 (en) 2001-05-15
GB9918776D0 (en) 1999-10-13
USRE45851E1 (en) 2016-01-19

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